A medium size moth (approx. 3 cm wingspan; females larger than males). Forrwings grey with few markings, consisting of a darker antemedian and erratic postmedian line, usually poorly marked. The reniform is usually indicated by a dark dot or bar bordered by pale scales. Hindwings pale orange-buff with a wide black border, and with the buff largely suffused with grey in many specimens. Body densly wooly-hairy, dark grey. Male antennae plumose; female simple. The illustrated specimen (from the Caribou Mnts of Alberta) is freshly emerged and unusually well marked.